Apparatus for lubricating pneumatic drills.



v. J. OBRIEN &,G. A. OLIVER.

APPARATUS FOR LU-BRICATING PNEUMAHIG DRILLS.

APPLICATION FILED OOT.19,1912.

1,1 14,641, Patented 0ct.20,1914

States, residing Denver and State of Colorado, have invented nnirnn STATES PATENT o VINCENT J. OBRIEN AND GEQRGE A. OLIVER, OF DENVER, COLORADU, CQIVIPANY, 01? DENVER, COLOEADG E.

THE STANDARD BUCK DRILL UF COLGRAJJO.

ASSISENORS TU CORPORATION Llldadll.

Specification of Letters Patent. Application filed. October 1D, 1912.

Patented oet. so, 1914'. Serial No. 726,587.

To all whom it may concern.

Be it known that we, VINCENT J. OBinnn and GEORGE Al OLIVER, citizens of the United in the city and county of certain new and useful Improvements in Apparatus for Lubricating Pneumatic Drills; and we do declare the followlng to be a full.

' clear, and exact description of the invention.

such as will enable others skilled in the art to which. it appertains to make and use the samefreference being had to the accompany ing drawings, and to the letters and figures oi reference marked thereon, which form a part of this specification.

Our invention relates to improvements in means for oiling the hammer barrel and sloping bar cylinder of a pneumatic drill.

it is adapted to be applied particularly to a drill of the nature shown in United States Patent No. 962,717, issued to Vincent J. O'Brien June 28, 1910.

Our invention constitutes means adapted to be operated by the throttle valve of the drill for utilizing pneumatic pressure to force the desired amount of oil into the working parts of the drill.

One object oi our invention is to provide means in connection with the throttle such that whenever the latter is moved to admit air to the hammer barrel a charge of oil will he delivered into the hammer barrel. This makes the oiling of the barrel ,automatic. and guards against injury to the working parts due to the carelessness of the operator in not supplying sullicient oil.

Our invention also provided means for th automatic oiling of the feed bar cylinder when the air first turned on from the supply hose.

Another object of our invention is to place .the contents of the oil cup under pressure whereby each charge of oil lorced to the desired point.

(hie emlmdiumnt of our invention is illustrated in the accompanying drawing, in which:

is positively Figure 1 is alview partly in sectio looking in the direction of the throttle val e handle. The section is-taken approximately on the line 1--1, Fig. 2, looking in the direction of the arrow, but-for the sake of clearness shows also in full lines the oil passage which l i l l l l l The same reference characters refer to the same parts in each of the viei s.

Inthe drawing we have illustrated only that portion of the drill which is directly connected with the oiling apparatus constituting our invention, the reference numeral 5 indicating the hammer barrel, while the feed bar is indicated at 7, the feed bar piston'at 8, and the feed bar cylinder at 9. A packing 10 is mounted in the feed bar piston 8 in order to prevent the leakage of air. A head-block 11 is interposed between the hammer barrel 5, and the feed bar cylinder 9, this head-block being threaded at 12 to re ceive the threads of an air-supply pipe (not shown) Co-nnnunicating with the space surrounded by these threads 12 is a conical valve seat 13 in which is rotatably mounted a valve piece l l having a cylindrical exposed portion 15 perforated at 16 to receive a pin 1'? for fixing to the valve piece a handle 18. A slot 19 is cut into the inner portion of the handle 18 extending partially around the circun'iference thereof, and a pin 20 fixed in the head-block ll acts as a stop against the ends of the slot 19 to limit the rotative action of the valve piece.

The head-block 11 has a portion 21 extending laterally, having a comparatively large bore. therein. this bore being threaded at 23in receive the threaded lower portion 2st of an oil cup 2?. A threaded plug 26 is provided to close the top of the oil cup 25 and to act as a plunger to force the oil downwardly. lVithin the cup is a tube 27 fixed by any suitable means in the lower portion 2% of the cup and terminating at its upper extremity just below the position of the plug 26 when s rewed down to its lowest position. Conimunicating with the bottom, of this tubeQi' is a ductlZEl which leads downwardly into a coi'nparatively short duct 29 in COllll11ll1llClloil cup has one other duct' A passage 3% connects this duct 32 with the annular passage in the lower portion of the oil cup, and, a passage connects timbers-22 to the valve seat. The passages and are in the same plane. in the larger end of the valve piece We provide a chumbcngfi which is always in communication with the air supply, provided the latter is turned on. W hen the valve piece is in the position shown in the drawing, the chamber is in communion tion with the duct 52 by means ot a duct 37, as is clearly sho vn in Fig. 2. A short duct 58 connects this chamber with the passage. 5%) when the valve piece slightly turned from the position illustrated in the drawing.

Extending entirely through the valve piece is a, duct L0 connected at one end to a short passage e1 formed along the side of the valve piece At its opposite end the duct &0 is connected to a passage 42 also formed in the side of the valve piece, this latter passage lacing angular and having a portion L from the handle of the valve piece and another portion extending toward. the handle and ending in an enlarged part which, in the position of the valve piece illustrated, is directly opposite the passage 35 leading from the bore In head-block there is a large passage is connecting the valve seat with the hammer barrel, through which the hammer bar" rel receives its -lI supply when the valve piece is rotated 'to cause the opening therein to register with the passage An.- other laws passage 4E6 extends through the heod-hlocl; in direct on parallel with the passage or by means of which the oressurc Within the hammer barrel and feed bar cylinder is equalized when the opening -17 extending entirely through the valve piece is caused to register with the passage -16. This condition is simultaneous with the registering of the opcningS and the passage 44%.

Although the construction and operation of the drill use whole do not enter into this application, it nmv be well to state that means are provided for equalizing the pressure in. the hammer barrel and feed bar cylinder in order that the drill maybe held up hi the work with just the proper amount of ii "essure.

Tlie operation of our improved oiling device lss's iollows: It should he understood um. When the drill is adiustcd lo the Workilig bosition, stoproclr in the air supply (not shown) is cut oil. lt'lreing assumed that the oil cu 25 is properly filled, the screw plug 24'; is turned comm-(21 to force oil through the tube 27, un ssagcs 29, 34, 3

and 37, intothe chamber 36, and through the passage 31 into: the bore 22, and through the passage 35 into the enlarged portion 43' of the passages? and thence through said pessage into the duct so extending through the gunner.

valve piece, the valve piece being understood to be in the position illustrated in the drawing, which is the position that it will occupy when the air supply is turned oil from communication with the hammer burrel. There being now charge of oil Within the chamber 36, the stop-cock in the air supply hose (not shown), is opened, W" ereby pressure is communicated through the possages 37, 32, 3e and 28 and the tube 27 to the surface of the oil in the oil cup 25, thus positively forcing oil through the passage 31 in the lower portion of the oil cup, the bore and the passages 55,43 and c2 into the duct l0 in the valve piece. The handle 18 of the valve piece is now turned slightly to cause the duct 38 to register with the possnge 39, whereupon the air pressure in the chamber 86 will force the oil therein into the feed her cylinder 9. Continuing the rotation of the handle 18 in the some direction, the passages 4-1 and 412 in the valve piece will he brought into register With the large passage l6 through the head-block, and the oil contained these passages and in the duct 40 will be forced into the hummer barrel due to the fact that the pressure in the hammer biirrel up to this time is atmospheric, While that in the feed her cylinder is greater than atmospheric pressure, on account of its preceding connection to the air supply through the duct 38 and the passage 39. A still further rotation of the handle 18 will bring the openings 4:5 and i? into register with the passages A and 4:6 respectively, whereupon the drill is set in motion.

Although we have described the motions of the valve piece whercby the difierent ducts and passages are brought into register scpcrutely, it should be understood that in practice this movement of the valve piece may be practically continuous. it at any time the operator should desire to send an additional charge of oil into the hammer barrel, it is necessary for him to merely turn the throttle off and on again.

We claim:

1. In combination with e head-block having a. valve seat therein and a passage there-- through intercepted by said valve seat, valve piece having :1 passage therethrough adapted to join the intercepted portions of said passage through the heud hlock when the valve piece is in one position, said valve piece having :1 second passage adapted to connect the intercepted portions of said passage through the l183d-lllGCl when said valve piece is in a second position, and means fort sup-plying said second passage with a charge of oil.

2. Zn apparatus of the class described, an air supply pipe, a hollow closed element, a head block mounted adjacent said clement, said head-block containing a valve seat, a rotatable valve piece mounted in said seat I and having a chamber arranged to be norpiece having two ducts one of which con- 1,114,e41 tit mally in communication with the air supply ipe an oil cup mounted upon said head bloc r, the latter having two passages connecting the oil cup and valve seat. said valve" nects one of said passages with the chamber when the valve piece is in one position and the other of which passes entirely through l the valve piece and is in communication l with the other of said passages when the valve piece is in the same position, passage in the head-block connecting the valve seat and hollow element, a duct in said valve piece connecting the last named passage with the said chamber when the valve piece is in a position at a slight angle to the first named position, said block having a passage therethrough connecting the hollow element with the opposite side-of the block and intercepted by the valve seat said duct passing entirely through the valve piece being adapted tobe brought into line with the last named passage in the head-block.

In combination, a head block, a throttle valve mounted therein and arranged to control the passage of air "from said valve in opposite directions through said block and means adapted to be controlled by the operation of said valve for forcing oil through said block in both of the a t'orcsaid directions.

4. In combination. head block, a throttle valve mounted therein and arranged to control the passage of air from said valve in opposite directions through said block and means adapted to be controlled by the operation of said alve for forcing oil through said block first in one of the aforesaid directions and then in the other.

In combination with a block. a throttle valve mounted therein and arranged to con trol the passage of air from said valve in opposite directions through said block. an oil cup mounted upon the block, saidvalve heing adapted to control admission of air to said cup and the passage of oil from said cup through said block to said valve'and l thence through said block in the aforesaid opposite directions.

(5. In eombination,.a head block, a hollow closed element mounted upon one side of said block, a throttle valve mounted within said block, said valve having an oil chamber and an oil passage, means for forcing oil into said chamber and passage and means con trolled by said Valve for forcing oil, under pressure from said chamber to the hollow element and for utilizing the pre sure in the latter to force the oil out of said passa 0 through the block to the side opposite the hollow element.

7. In combination, a head block, hollow closed element mounted upon one side of said block, a throttle valve mounted within said block, said valve having an oil passage therethrough, means'lor forcing oil into said passage and means controlled by the valve for admitting air under pressure to said h llow element and then utilizing the vpressm P in said hollow element to force the oil in as. passage through the block to the side opposite the hollow element.

8. In combination, a head block provided with an air passage therethrough, and vith a valve seat intercepting said passage. a rotatable valve piece mounted in said sea 1. said valve piece having an air passage therethrough adapted to aline 'ith the first named passage. said' valve piece having also a comparatively small oil passage there thromyh to one side of the air passage and at an angle therewith, the endsof said oil pas sage extending into the zone of the air pas sage whereby, when the valve piece is at the proper angle, the portions of the air passage in the block are joined by the said oil pas- In testimony whereof we alhx our signatures in presence of two witnesses.

VINCENT J. OBRIEN. GEORGE A. OLIVER. Witnesses Eva L. H LL, MAY CLEMENTS. 

